CSI-RS Resource Configuration for FD-MIMO Systems
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Solution Overview
Problem
Existing CSI-RS resource configurations in FD-MIMO systems lead to inefficient use of resources, particularly when configuring 20 or 28 ports, resulting in wasted resources and increased signaling overheads due to the need to remove CDMs from each CDM group.
Innovation Solution
The method involves sending a 2N-port CSI-RS resource sequence number to a terminal device, allowing it to determine an N-port CSI-RS resource by aggregating N-port CSI-RS sub-resources across two adjacent PRBs, thereby reducing the need to remove CDMs and optimizing resource utilization for 20 and 28 port configurations without altering the existing standard.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If CDM-8 is used for code division multiplexing on redefined 8-port CSI-RSs to effectively use power, then power utilization is improved, but impact on original standard increases and more invalid resources are consumed for 20 ports
Solution Approach 1:
The patent segments the 32-port CSI-RS resource into multiple 8-port CSI-RS resources, and further segments the 8-port resources into 4-port resources. This segmentation allows flexible configuration for 20 ports by using only the necessary 4-port resources without requiring CDM-8, thereby reducing invalid resource consumption while maintaining power efficiency.
Solution Approach 2:
Instead of using full CDM-8 for all 8-port resources, the patent applies partial action by using only CDM-4 for the necessary 4-port resources in 20-port configurations. This avoids the excessive action of removing three CDMs from each CDM group, reducing invalid resource consumption while maintaining sufficient power utilization.
2Use of energy by moving object
If 8-port CSI-RS is redefined and four newly-defined 8-port CSI-RSs are used to aggregate 32-port CSI-RS, then power is effectively used, but device complexity increases
Solution Approach 1:
The patent segments the complex 8-port CSI-RS configuration into simpler 4-port CSI-RS units. This segmentation reduces device complexity by using standard 4-port configurations that require fewer CDM groups, while maintaining power effectiveness through proper aggregation and power boosting on the necessary resources.
Solution Approach 2:
Instead of redefining 8-port CSI-RS as the basic unit (which increases complexity), the patent inverts the approach by using 4-port CSI-RS as the basic unit. This inversion simplifies the configuration while achieving the same power effectiveness through selective aggregation of 4-port resources.
3Stability of the object's composition
If three CDMs are removed from each CDM group to obtain 20 ports, then resource occupancy is consistent with 32 ports, but more invalid resources are consumed
Solution Approach 1:
The patent segments the 20-port configuration into multiple 4-port CSI-RS resources instead of using a single 8-port resource with removed CDMs. This segmentation maintains resource occupancy consistency with 32-port configurations while avoiding the creation of invalid resources, as each 4-port resource uses its full complement of CDM groups efficiently.
Data Source
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AI summary
This application discloses a signal resource configuration method, a terminal, and an access network device, to reduce impact on an existing standard and save CSI-RS resources. The method in embodiments of the present invention includes: sending, by an access network device, a 2N-port channel measurement pilot signal CSI-RS resource sequence number to a terminal device, where the 2N-port CSI-RS resource sequence number is used to notify the terminal device of an N-port CSI-RS resource in two adjacent PRBs, and N is a positive integer.